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Diagnosis & Repair

  1. Inspect for spark at plugs. Remove wire from individual spark plug. Remove spark plug and insert into wire. Disconnect appropriate injector harness connector. Ground spark plug and crank engine. Ensure spark is present.
  2. If spark does not exist, go to step 5). If spark does exist, inspect IGF circuit between distributor and ECM for short or open. See wiring diagram in the WIRING DIAGRAMS - 1.8L article.
  3. Repair as needed. If circuit is okay, disconnect igniter connector. Igniter is behind DLC1 connector. Access ECM behind center console underneath passenger floor mat. Turn ignition on. Using DVOM, backprobe ECM connector.
  4. Measure voltage between terminal IGF and ground. See Fig 1. If voltage is 4.5-5.5 volts, replace igniter and retest. If voltage is NOT 4.5-5.5 volts, replace ECM and retest.
  5. Access ECM behind center console underneath passenger floor mat. Turn ignition on. Using DVOM, backprobe ECM connector. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. Voltage should be .5-1.0 volt.
  6. If voltage is within specification, go to next step. If voltage is NOT within specification, go to step 11).
  7. Disconnect igniter connector. Igniter is located behind DLC1 connector. Measure voltage between harness connector terminal No. 3 and ground. See Fig 2. Turn ignition switch to ON position. Voltage should be 9-14 volts. Turn ignition switch to START position. Voltage should be 9-14 volts.
  8. If voltage is NOT within specification, inspect igniter power supply circuit. See wiring diagram in WIRING DIAGRAMS - 1.8L article. Repair as needed.
  9. If voltage is within specification, inspect circuit between ignition switch and ignition coil, ignition coil and igniter for open or short. See wiring diagram in WIRING DIAGRAMS - 1.8L article. Repair as needed. If circuit is okay, go to next step.
  10. Inspect ignition coil. See the BASIC TESTING - 1.8L article. Replace as needed. If coil is okay, replace igniter in distributor and retest.
  11. Access ECM behind center console underneath passenger floor mat. Turn ignition on. Using DVOM, backprobe ECM connector. Ensure igniter is disconnected. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. See Fig 1. Voltage should be .5-1.0 volt.
  12. If voltage is within specification, replace igniter and retest. If voltage is NOT within specification, inspect IGT circuit between igniter and ECM for open or short. Repair as needed. If circuit is okay, replace ECM and retest.
Fig 1: Identifying ECM Connector Terminals
G95E32114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying Igniter Harness Connector Terminals
G95I31375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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